Arnold, M. --letters to: --a lost umbrella. --"St. Paul and Protestantism". --on death of his son. Arolla, first visit to. --second visit to. Aryans, origin of. Ascidians, new species of. --Doliolum and Appendicularia. --on the structure of. --catalogue of. Ashby, Mr., on sanitary work. Ashley, Hon. E., Vivisection Bill. Atavism, defence of the word. Athanasian Creed, anecdote. Atheism logically untenable. Athenaeum Club, elected to. Augustan epoch to be beaten by an English epoch. Automatism, Darwin suggests he should review himself on. Auvergne, trip in. --glaciation in. --prehistoric skeleton at Le Puy. Babbage, calculating machine, and the theory of induction. Bacon, influence of. --character. "Baconian Induction," criticism of. --Spedding on. Baer, von, influence of. --his Copley Medal. --his work. Bailey, F., at Lynton. Baillon, led to make fresh observations through Huxley's Gentian paper. Bain, Professor A. Balaam-Centaur. Balfour, Right Hon. A., critique on his "Foundations of Belief". Balfour, Francis. --death of. --obituary. --likeness to Huxley. --looked to as his successor. --opinion of. Ball, John, with Huxley at Belfast. Ball, W. Platt, letter to: criticises his "Use and Disuse": advice as to future work. Baptism. "Barriers, The Three". Barry, Bishop, on Huxley's work on the School Board. Bastian, Dr. H. Charlton, on spontaneous generation. Bateson, Mr., letter to: his book "On Variation" returns from speculation to fact: natura facit saltum. Bathybius. --not accepted in connection with Darwin's speculations. --"eating the leek" about. Baynes, Thomas Spencer, letters to: --Aberdeen Address. --parsons at Edinburgh lectures. --regime for health. --arrangements for the "Encyclopaedia". --articles for "Encyclopaedia". --work on Dick Swiveller's principle. --handwriting. --puts aside a subject when done with. --a Balaam-Centaur. --Dean Stanley's handwriting. --articles between H. and L. --sons-in-law. --Biology contrasted with Criticism, etc. --reports of his American trip. --Harvey article. Beale, Professor. Beaufort, Sir F. (Hydrographer). --assistance from. Beaumont, Elie de, contradicted by nature. Belemnites, on. Bell, Thomas, ready to help. --as man of science. --writes official statement on the award of Royal Society Medal to Huxley. Bence Jones, Dr., kindness of. --would make the Fullerian Professorship permanent. --friendly conspiracy. Bennett, Risdon, and F.R.S. Bentham, G., at x Club. Benvenuto Cellini. Berkeley. --proposed book on. Berkeley, Rev. M.J., mycological work. Besant, Mrs., exclusion from University College. Besant, Sir W., Huxley's face. Bible-reading in elementary schools. Biological teaching, revolutionised. --Darwin on. Biology, on the study of. Birds, distension of air-cells in flight. --investigations into the structure of. --classification of. --toothed, proposed lecture on. --geological history of. Birds and reptiles, relations of.